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#1 |
Registered User
Join Date: Jan 2003
Posts: 2
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Front Disk Brake Problem
I recently put a new power booster on my 72 Cheyenne Super 20. The brakes were stronger.....but now they tend to build up pressure and not release it. The front wheels will totally lock until I bleed off the pressure.
I did have to back the brake light adjustement off about a 1/4 inch after installing the booster. Is it possible that the booster and master cylinder for the 72 - 3/4 ton can have different possible combinations?? Is there any type of check valve in the brake system that could cause the pressure to not release??
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Big Rick 1972 Cheyenne Super 20 |
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#2 |
Registered User
Join Date: Jan 2001
Location: Killingworth, CT. USA
Posts: 3,378
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If the piston within the master is being held from returning ALL the way back you will have the problem you descibe. Could be the push pin needs to be adjusted, some of them have a adjustment on the tip, this would also explain why you have to adjust the brake light switch. Could be the booster was to fit a drum brake master?
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1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist. |
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#3 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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You might try loosening the master where it bolts to the booster to see if that relieves the drag on the front brakes. If that works, a shim tween the master & booster should set you up. Good luck......crazyL
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#4 |
Registered User
Join Date: Jan 2003
Posts: 2
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Thanks, I will give the shim a try.
Love the site!!! Rhode Island and Connecticut...Who would have thought I would get my answers from there? How do you find or keep those 30 year old trucks from rusting up there?
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Big Rick 1972 Cheyenne Super 20 |
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#5 |
Registered User
Join Date: Jan 2001
Location: Killingworth, CT. USA
Posts: 3,378
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How do you find or keep those 30 year old trucks from rusting up there?
Answer, You don't! Where do you call home?
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1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist. |
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#6 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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72super 20, if you find an adjuster, by all means use it! If you need to shim, a 2 or 3 washers will be a temp deal(carefully). By shim, I should be clear........it should be the shape of the back of the master, & have 3 holes in it(2 for the studs &1 for the pin). Gordo......up here we cant stop the trucks from rusting, we just have to try to slow the process down!
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#7 |
Led Sled! Discs R 4 ME!
![]() Join Date: Jan 2001
Location: Toms River, NJ, USA (Transplanted Hoosier)
Posts: 7,327
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Also check the brake light switch for proper adjustment.
It can hold the piston from returning completely. If you altered it in any way I would check that first, then onto to what was stated above. Denny |
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#8 |
Registered User
Join Date: Mar 2002
Location: Agua Dulce, Ca. usa
Posts: 179
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Check to see that you do not have the check valve in the m/c we did and the front discs did not release without relieving brake flluid pressure at the m/c. Just a suggestion worked for our case thanks to the help of this group. Ed ke6bnl
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Ed ke6bnl Agua Dulce 70 S.E. Los Angeles 70 Chevy short bed 1948 F3 ford pu 1949 F1 stock V8 flathead 3 on floor 1950 F1 pu street rod 1948 F6 Ford Dually/350sbc no bed stock trans&rear 1972 El Camino 4" chop 1953 Chevy 3100 2b daily driver 1970 SB 4X4 400ci 6in lift |
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